A woman and two children have been found dead at a house, police said.
The 34-year-old woman and two girls, aged nine and four, were discovered at a property in Midcroft, Ruislip, at 6.40pm last night.
Scotland Yard said that detectives from the Homicide and Serious Crime Command were investigating.
At this stage, the deaths are being treated as unexplained and next of kin have been informed.
More top news
The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants